Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh hai » thanh hai, nhanh hai, hang hai
thi hanh » thi thanh
vat hanh » vat thanh, van hanh, va hanh
hai cua » thai cua, dai cua, hoi cua
su sach » so sach
vu sach » vu bach, vu khach
hanh xu » hanh tu, hanh sua, hanh cua
ve nam » he nam, va nam, te nam
le nam » ly nam, he nam, le na
xu hoi » xa hoi, lu hoi, vu hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) thi hanh xu hoi. hieu ((ve nam) OR (le nam)) thuc vat hanh hai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) thi hanh xu hoi. hieu ((ve nam) OR (le nam)) thuc vat hanh hai cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) thi hanh xu hoi. hieu ((ve nam) OR (le nam)) thuc vat hanh hai cua viet*".